Jeva：从第一性原理构建 System One 决策模型
原标题：Paper page - Jeva: System One Models from First Principles
AI 摘要
该论文提出 Jeva，一种面向 System One 决策的决策原生架构，旨在同时满足四项结构要求：null 感知、排列不变性、选项可扩展性和可缓存性。Jeva 通过共享编码器独立表示请求与每个选项，并用紧凑决策栈仅针对请求状态进行精炼，从而统一 Choice、Noul 和 Score 输出。其 4B 模型支持 2048 个候选，在测试排列下无决策翻转，并借助跨请求复用实现超过 20 倍的中位延迟加速，代码与模型权重已公开。
正文节选
Abstract System one models enable direct, low-latency decision-making. Yet recent practice of predicting an answer from serialized text does not, by itself, respect the structure of a decision problem. We argue that current designs underemphasize four important structural requirements. (i) null-aware: Models should distinguish answer absence from uncertainty among candidates; (ii) permutation-invariant: Reordering alternatives should not change the decision; (iii) option-scalable: Growing candid